1733247 - Cannot disable HTTP3 when TRR is enabled

Status: RESOLVED FIXED

(Core :: Networking: HTTP, defect, P1)

Description

[Jan Alexander Steffens [:heftig]]

When network.trr.mode = 3 is set, network.http.http3.enabled = false no longer has an effect and HTTP3 connections are still made.

To test:

mozregression --launch 2021-09-20 -a https://www.cloudflare.com/ -a about:networking --pref network.http.http3.enabled:false network.trr.mode:3

about:networking will show a HTTP/3 connection to www.cloudflare.com.
With the 2021-09-19 nightly, this is not the case.

Last good revision: 89fd324708c584602ee48317c1cd95c140f51b1d
First bad revision: d6d54cc66ce65330f016b917fcced1acc0a32a12
Pushlog: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=89fd324708c584602ee48317c1cd95c140f51b1d&tochange=d6d54cc66ce65330f016b917fcced1acc0a32a12

Regressed by bug 1726528.

Comment 1

[Dragana Damjanovic [:dragana]]

Kershaw, can you take a look?

Comment 2

[Dragana Damjanovic [:dragana]]

Changing severity to S3 because of this is a resent regression and the only effect of the bug is that HTTP/3 cannot be disabled by respective pref, but another pref is needed as well. The browsing behavior is not affected.

Comment 3

[Kershaw Chang [:kershaw]]

Attachment: Bug 1733247 - Check the http3 pref when selecting an npnToken, r=#necko

Comment 4

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1726528

Comment 5

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/a7ccddaf1154
Check the http3 pref when selecting an npnToken, r=necko-reviewers,dragana

Comment 6

[Natalia Csoregi [:nataliaCs]]

https://hg.mozilla.org/mozilla-central/rev/a7ccddaf1154